Maybe people don’t share/promote CF much b/c they don’t actually want their social circle to read it. for two reasons. 1) for privacy. i make them talk on public forum but they want private forum, so they just don’t tell anyone it exists. then it’s more like private help that most the ppl in their life don’t see, like getting a draft edited in private. or like if they are gonna have any student-type interactions or receive criticism, they don’t want their friends and colleagues to see it. 2) so they can impress ppl by saying sound bites from here. you wouldn’t want to share your source of clever remarks and reveal that you aren’t thinking of them yourself.
not sharing FI is partly a way to get (semi) private help without paying for privacy.